Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Poster: Charged Soft Matter, Polyelectrolytes, Ionic Liquids

CPP 26.3: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster B2

Multiresponsive hydrogels from telechelic polyelectrolytes — •Chia-Hsin Ko¹, Margarita A. Dyakonova¹, Konstantinos N. Raftopoulos¹, Sandra Gkermpoura², M. M. Soledad Lencina², Constantinos Tsitsilianis², and Christine M. Papadakis¹ — ¹TU München, Physik-Department, Garching, Germany — ²University of Patras, Department of Chemical Engineering, Patras, Greece

Multiresponsive polymeric hydrogels offer a rich switching behavior. We investigate the structural properties of self-assembled pH- and thermo-responsive hydrogels from ABA triblock terpolymers, bearing a pH-responsive central block and thermo-responsive hydrophobic end blocks P(nBuMA-co-TEGMA)-b-PDMAEMA-b-(nBuMA-co-TEGMA) (nBuMA, TEGMA and DMAEMA are n-butyl methacrylate, tri-(ethylene glycol)methyl ether methacrylate and 2-(dimethylamino)ethyl methacrylate). Varying temperature, it is possible to alter the water-solubility of TEGMA and, thus, to influence the exchange dynamics of the stickers. The rheological properties of hydrogels have been found to depend strongly on pH and temperature. A transition from a dynamic hydrogel network to a kinetically frozen network upon increase in temperature was indeed found. pH variation significantly affects the dynamic behavior of formed hydrogels because it alters the degree of stretching of the middle PDMAEMA block. In order to investigate the internal architecture of the hydrogels, we perform small-angle X-ray scattering (SAXS) in dependence on pH and temperature.